
Review of Short Phrases and Links 
This Review contains major "Zero Eccentricity" related terms, short phrases and links grouped together in the form of Encyclopedia article.
Definitions
 Orbits with zero eccentricity (e = 0) are circular; orbits with eccentricities close to 1 (e ~ 1) are long and skinny.
 Orbits with zero eccentricity (e = 0) are circular; orbits with eccentricities close to 1 (e ~ 1) are long and skinny.
 In the case of the circle, the centre is the focus, and the line at infinity the directrix; we therefore see that a circle is a conic of zero eccentricity.
 A circle has zero eccentricity, and most of the planets have orbits which are nearly circles.
 Circular orbits are a special case of elliptical orbits but with a zero eccentricity.
 Particles at zero free eccentricity near an eccentric planet have similar dynamics to those at zero eccentricity near a planet in a circular orbit.
 So a circular orbit is an elliptical orbit with zero eccentricity.
Zero Eccentricity
 Circular orbits Although most orbits are elliptical in nature, a special case is the circular orbit, which is an ellipse of zero eccentricity.
 A circle may be viewed as a special case of an ellipse with zero eccentricity, while as the ellipse becomes more flattened the eccentricity approaches one.
 A circle has zero eccentricity, and most of the planet s have orbit s which are nearly circle s.
Categories
 Universe > Planets > Orbits > Circular Orbit
 Encyclopedia of Keywords > Thought > Special Case
 Ellipse
 Elliptical Orbit
 Foci

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